湿热对PI/MoS_2涂层性能的影响

Hygrothermal Effects on PI/MoS_2 Disulfide Lubrication Coating

对钛合金表面的PI/Mo S2涂层进行了湿热老化试验,在70℃、98%RH条件下存储长达27 d。采用衰减全反射红外光谱和透射红外光谱分别对涂层表面及涂层进行分析测试,利用X射线光电子能谱对涂层表面成分进行分析。通过球盘摩擦试验机考察了湿热老化对润滑涂层的真空及大气摩擦性能的影响。采用拉脱法测试了湿热老化前后涂层附着力。结果表明,湿热会导致PI/Mo S2润滑涂层表面的胶黏剂聚酰亚胺被水解侵蚀,膜层表面深度在50 nm以内的部分Mo S2被氧化。湿热试验前后涂层的真空耐磨寿命降低13%,大气耐磨寿命降低16%;真空摩擦因数略有增加且波动增大,而大气摩擦因数显著增加,涂层附着强度也略显降低。

In this study, PI/MoS2 lubrication coating was deposited on titanium alloy. This coating was exposed to a highly aggressive humidity durability test, test conditions were 70℃, 98% relative humidity for 27 days. The effects of hygrothermal on the chemical structure of the binder were studied by ATR-FTIR and FTIR. And the chan- ges of surface chemical components were investigated by XPS. The friction and wear behaviors of the coatings after hy- grothermal test were studied by ball-on-disc tribometer. Pull off adhesive tester was used to evaluate the adhesion strength of the coating. The results indicated that the treatment caused the PI resin at the surface of the coating to be corroded, part of the resin in the coating hydrolyzed and the MoS2 at the surface to be oxidized. The wear life de- creased 13% in vacuum and 16% mospheric environment. Adhesion at atmophere environment. The friction coefficient increased more greatly in the at- of the films decreased slightly.